AllergyZone Furnace Filters - 4-Pack, carry the manufacturer's Filter Quality Triangle rating of 12, indicating superior performance in three areas crucial to healthy indoor air quality: air flow, efficiency, and holding capacity. AllergyZone filters are 95% efficient at removing small airborne particles that trigger allergy and asthma symptoms, and provide excellent air flow and particulate retention over the life of the filter. Developed by an allergy and asthma physician, the AllergyZone high-efficiency filter provides excellent overall performance at a cost of just pennies a day. Replace every 3 months for best performance. Standard 1" thick filters available in six (6) sizes. Sold in packs of 4 filters.
When to Replace the Filter: